The missing woman's body is located in the deep waters near Fort Zancudo. Either take a submarine or use some Scuba gear and dive down to the ocean floor to find the woman's body in an unfortunate position.

Once the dead body has been located, it's time to find the confession letter! To access the letter, go to Solomon Richards' office at the Richards Majestic studio AFTER 9PM. There will be an yellow marker in front of his office that will NOT be shown on the map.